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POST UTME GREENFIELD UNIVERSITY 2024 Chemistry | Objective

Are you preparing for POST UTME GREENFIELD UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2024 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1

Determine the pH of a 0.1 M solution of hydrochloric acid (HCl) at 25°C.

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 2

What is the major product of the reaction between 2-methylpropane and chlorine?

A. 2-chloro-2-methylpropane

Correct B. 2-chloro-2-methylpropane and 2,2-dichloro-2-methylpropane

C. 2,2-dichloro-2-methylpropane

D. 2-chloro-2-methylpropane and 2-chloro-2-methylpropane

Correct Answer: B

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Question 3

A 25.0 mL sample of 0.100 M NaOH is titrated with 0.100 M HCl. What is the pH of the solution after the reaction is complete?

Correct A. 7

B. 8

C. 9

D. 10

Correct Answer: A

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Question 4

What is the s\tandard enthalpy of formation of CO2(g) at 298 K?

Correct A. -393.5 kJ/mol

B. -393.5 kJ/mol

C. -393.5 kJ/mol

D. -393.5 kJ/mol

Correct Answer: A

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Question 5

A diagram of a titration setup is shown below. What is the purpose of the burette?

Correct A. To measure the volume of the titrant

B. To measure the volume of the analyte

C. To mix the titrant and analyte

D. To measure the pH of the solution

Correct Answer: A

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Question 6

Determine the pH of a 0.1 M solution of HCl at 25°C. The dissociation cons\tant of HCl is 10^\( -7 \).

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 7

A 25 mL sample of 0.2 M H2SO4 is titrated with 0.1 M NaOH. Calculate the number of moles of NaOH required to reach the equivalence point.

A. 0.005

Correct B. 0.01

C. 0.015

D. 0.02

Correct Answer: B

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Question 8

The atomic radius of an element is 100 pm. If the element has an atomic number of 20, what is its electron configuration?

Correct A. 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10

B. 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^8

C. 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^9

D. 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6

Correct Answer: A

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Question 9

A 2.0 g sample of a subs\tance is dissolved in 100 mL of water. The resulting solution has a conductivity of 0.05 S/m. What is the molar conductivity of the solution?

A. 0.01

B. 0.02

Correct C. 0.03

D. 0.04

Correct Answer: C

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Question 10

A 1.0 g sample of a subs\tance is heated to 100°C. The resulting gas has a volume of 2.0 L at 1 atm. What is the molar mass of the subs\tance?

A. 20

B. 30

Correct C. 40

D. 50

Correct Answer: C

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Question 11

Determine the number of moles of carbon dioxide produced when 2.50 g of calcium carbonate (CaCO3) is decomposed at cons\tant pressure and temperature.

A. 0.050 mol

Correct B. 0.100 mol

C. 0.150 mol

D. 0.200 mol

Correct Answer: B

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Question 12

A 2.0 M solution of hydrochloric acid (HCl) is mixed with a 2.0 M solution of sodium hydroxide (NaOH). What is the pH of the resulting solution?

A. 1.0

B. 2.0

C. 3.0

Correct D. 4.0

Correct Answer: D

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Question 13

A sample of an unknown organic compound has a molecular formula of C4H8O. What is the IUPAC name of the compound?

Correct A. Bu\tan-2-ol

B. Bu\tan-1-ol

C. Bu\tan-2-one

D. Bu\tan-1-ol

Correct Answer: A

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Question 14

A 1.0 M solution of sulfuric acid (H2SO4) is mixed with a 1.0 M solution of sodium hydroxide (NaOH). What is the concentration of the resulting solution?

A. 0.5 M

Correct B. 1.0 M

C. 1.5 M

D. 2.0 M

Correct Answer: B

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Question 15

A sample of an unknown metal has a mass of 25.0 g and a volume of 5.0 cm3. What is the density of the metal?

A. 2.0 g/cm3

B. 3.0 g/cm3

Correct C. 4.0 g/cm3

D. 5.0 g/cm3

Correct Answer: C

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Question 16

A polymer is a large molecule composed of many repeated subunits called monomers. What is the primary function of the monomers in a polymer?

Correct A. To provide structural support to the polymer

B. To increase the polymer's thermal stability

C. To enhance the polymer's electrical conductivity

D. To improve the polymer's optical clarity

Correct Answer: A

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Question 17

A gas is compressed to half its original volume. What is the effect on its pressure?

A. The pressure increases by a factor of 2

Correct B. The pressure decreases by a factor of 2

C. The pressure remains unchanged

D. The pressure increases by a factor of 4

Correct Answer: B

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Question 18

A solution is prepared by dissolving 10g of sugar in 100g of water. What is the mass percentage of sugar in the solution?

A. 5%

Correct B. 10%

C. 15%

D. 20%

Correct Answer: B

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Question 19

A strong acid is one that completely dissociates in water to produce a high concentration of hydrogen ions. What is the pH of a 0.1M solution of hydrochloric acid?

Correct A. 1

B. 2

C. 3

D. 4

Correct Answer: A

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Question 20

A chemical bond is formed when two atoms share one or more pairs of electrons to achieve a stable electronic configuration. What type of bond is formed between two oxygen atoms in a molecule of oxygen gas?

A. Ionic bond

Correct B. Covalent bond

C. Hydrogen bond

D. Van der Waals bond

Correct Answer: B

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Question 21

Calculate the s\tandard enthalpy of formation of CO2(g) from the following data: ΔHf(CO2(g)) = -393.5 kJ/mol, ΔHf(C) = 0 kJ/mol, ΔHf(O2(g)) = 0 kJ/mol.

Correct A. -393.5 kJ/mol

B. -394.5 kJ/mol

C. -395.5 kJ/mol

D. -396.5 kJ/mol

Correct Answer: A

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Question 22

The reaction of an alkanol with a strong acid produces a salt and water. Which of the following alkanols will produce a salt with the highest boiling point?

A. methanol

B. ethanol

C. propanol

Correct D. bu\tanol

Correct Answer: D

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Question 23

A solution of a weak acid in water is 0.1 M. If the acid is 10% dissociated, what is the concentration of hydrogen ions in the solution?

A. 0.001 M

Correct B. 0.01 M

C. 0.1 M

D. 1 M

Correct Answer: B

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Question 24

A sample of a metal oxide has a mass of 25 g and a volume of 5 cm^3. If the density of the oxide is 5 g/cm^3, what is the molar mass of the oxide?

A. 200 g/mol

Correct B. 300 g/mol

C. 400 g/mol

D. 500 g/mol

Correct Answer: B

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Question 25

A polymer has a molecular weight of 100,000 g/mol and a degree of polymerization of 500. What is the molar mass of the monomer?

A. 150 g/mol

Correct B. 200 g/mol

C. 250 g/mol

D. 300 g/mol

Correct Answer: B

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